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https://issues.apache.org/jira/browse/COLLECTIONS-403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604732#comment-13604732
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Thomas Neidhart commented on COLLECTIONS-403:
---------------------------------------------
The reason these classes are final is because their behavior is well defined
and not supposed to be changed by sub-classes.
To prevent sub-classing, they are marked as final.
> Make AndPredicate, AnyPredicate etc. not final
> ----------------------------------------------
>
> Key: COLLECTIONS-403
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-403
> Project: Commons Collections
> Issue Type: Improvement
> Components: Collection
> Affects Versions: 3.2.1
> Reporter: david cogen
> Priority: Minor
>
> If there is no good reason for these (and similar classes) to not be final,
> they would be much more useful to me if they were not final.
> I have a class that I wanted to have an "is a" relation to AnyPredicate, but,
> AnyPredicate being declared final, I cannot and instead have to design it
> with a "has a" relation to AnyPredicate, which for my purpose is much less
> clear.
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